Photographic shutter.



No. 744,998. PATENTED NOV. 24, 1903. T. BRUEGK.

PHOTOGRAPHIG SHUTTER.

APPLICATION FILED FEB. 18, 1902.

4 SHEETS-SHEET 1.

' MODEL.

I nventor.

ynesses.

X. Attorney mc'uonms PEYER$ co. wnmnuma, WASHINGTON. n

PATBNTED NOV. 24, 1903.

T. BRUEGK. PHOTOGRAPHIG SHUTTER.- APPLICATION FILED FEB. 18, 1902. MODEL. 4 SHEETS-SHEBT 2.

Witnesses. I nventor.

wv Attorney m: Norms Perms co PHUTO-UYHU, \wnumnwwv a. c.

VPATENTED NOV. 24, 1903. 1

T. BRUEGK. PHOTOGRAPHIG SHUTTER.

APPLICATION FILED FEB. 18,.1902.

4 SHEETS-SHEET 3.

MODEL.

r O t n e v n Wit messesv l LM Attorney PATENTED NOV. 24, 1903.

T. BRUBGK. PHOTOGRAPHIG SHUTTER.

APPLICATION FILED FEB. 18, 1902.

4 SHEETS-SHEET 4.

MODEL.

Inventor.

Witnesses- 5;. Attorney UNITED STATES Eatented November 24:, 1903.

PATENT OEEICE.

THEODOR BRUEOK, OF ROCHESTER, NEW YORK, ASSIGNOR TO BAUSOll d LOMB OPTICAL COMPANY, OF ROCHESTER, NE\V YORK, A CORPORA- TION OF NEXV YORK.

PHOTOGRAPHIC SHUTTER.

SPECIFICATION forming part of Letters Patent No. 744,998, dated November 24, 1903.

Application filed February 18. 1902. Serial No. 941,573. (Modeld To all whom, it may concern:

Be it known that I, THEoDon BRUEOK, of Rochester, in the county of Monroe and State of New York, have invented certain new and useful Improvements in Photographic Shutters; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the reference-numerals marked thereon.

My present invention relates to photographic shutters, particularly of the class capable of making time, bulb, instantaneous, and automatically-timed exposures; and it has for its object to provide a shutter in which the duration of automatically-timed exposures may be varied as desired and the construction and operation of the parts simplified.

The invention consists of certain improvements hereinafter described, the novel features being setforth particularly in the claims.

in the accompanying drawings, Figure 1 is a front elevation of a photographic shutter embodying my improvements. Fig. 2 is a sectional view looking from the rear and showing the shutter leaves or blades; Fig. 8, a sectional view on the line a a of 1; Fig. 3, a sectional view on the line b b of Fig. 4:. Fig. 4 is a view of the operating parts with the front coverplate removed with the parts set for making a time exposure. Fig. 5 is a similar view with the shutter open during a time exposure. Fig. 6 is a similar view showing the parts just before the shutter is closed during a time exposure; Fig. 7, a similar view showing the blades open during a bulb exposure. Figs. 8 and 9 are similar views showing the position of the parts when making an instantaneous or timed instantaneous exposure. Fig. 10 is a sectional view taken in rear of the master member looking toward the front and showing the relation of the master member and retarding device.

Similar reference-numerals in the several figures indicate similar parts.

The main casing of the shutter, to which my invention is shown applied, may be of any suitable construction, but preferably consists of an annular casing l, embodying the back plate and the rim, to which latter is secured the removable front plate 2 and provided with an intermediate septum or su iiporting-plate 3, secured between the front and back plate in any suitable or usual manner.

4 indicates the shutter blades or leaves, pivoted at 5 to suitable pins and having the short projections 6, extending between pins or projections 7, located at the rear side of an exposure lever or member 8, pivoted at 9, upon the plate 3 and moved downwardly or toward the center of the shuttencasing by a spring 10 and which will normally hold the shutter leaves or blades closed, as shown in Fig. 2. Also arranged upon the exposure lever or member 10 is a pin or projection 11, with which is adapted to cooperate the end of a master member or lever 12, pivoted at 13 on the supporting-plate 3 and operated upon by a spring 14:, coiled around its pivot, having one end engaging a projection 15 on the plate or support 3. One endIlB of the nuts terlever is inclined and is adapted to cooperate with a pin or projection 17 on the exposure-lever when moved outwardly by its spring to move the exposure-lever in a direction to open the shutter-blades and then, as the pivotal centers of said levers are different, the exposure-lever is released and allowed to return to normal position, closing the shutter again. The end of the pin 17 is beveled and the end of the master member slightly inclined, so that it may slide over the pin without operating it and return to normal position, as shown in Fig. at. The pin and the end of the master member form a latch connection yielding laterally of the members or levers themselves.

The lower end 18 of the master-lever is also beveled or inclined slightly and is adapted to be engaged by a pin 19 on a lever 20, pivoted at 21, actuated by a spring and having a pin or projection 22, engaged by an operating-lever 23, pivoted at 2%. The pin 19 traverses an arc intersecting that traversed by the end 18, and its outer end is beveled similar to the pin 17 on the exposure-lever, so that when the pin is moved outward it will carry the master-lever and then will release it, the beveled end of the pin passing under said end' 18 of the master-lever, which yields laterally Without operating it.

Near the upper end of the master member is a pin or projection 26, with which the time and bulb stops cooperate to arrest said member to hold the shutter open. The time-stop embodies the beveled projection 27 and the bulb-stop a lug 28, arranged on the arms of a controlling member 29, pivoted at 30 and hav-- ing a lug or projection 31 at its rear side adapted to cooperate with a projection 32 on the operating member 23 and also a lug or projection adapted to cooperate with the end of a spring-actuated arm 34-, pivoted at The controlling member 29 is turned by a spring 36 to hold the lug 33 against the arm 34.; but the spring 257, operating the latter, is the stronger. Therefore the position of the arm Sat governs that of the controlling member. The arm 3% is provided with a pin 38, normally held against the edge of a setting member :30 in the form of a ring plate arranged within the casing and adapted to be turned by an operating-finger 4:0, cooperating with a scale 41 on the casing, to bring the projections 42 and 43 into engagement therewith, the projection L2 moving the arm 3% far enough to allow the bulb-stop on the controllingmember to engage the pin on the master member and make a bulb exposure and the projection l3 operating the controlling member far enough to allow the time-stop to engage said pin and, as will be understood, make a time exposure. The setting plate or member fits within the annular casing and is 'uided in its movements thereby, and for the purpose of affording additional friction and preventing accidental movement it is split near a free end to form a more or less elastic or spring arm 92, which bears against the casing, as shown in Fig. 9.

In making bulb exposures the actuation of the operating-lever 2-3 will move the master member through the lever 20 and release it as described, allowing it to be caught by the projection 28, as shown in Fig. 7, and the release of the operating-lever will permit the spring 25 to return the operating-lever, and the pin 32 engaging the projection 81 will release the bulb-stop and allow the shutter to close.

In making a time exposure the arm Si is at the extreme position (shown in Fig. 4t) away from the lug 53 of the controlling member, and. the first pressure on the operating-lever will actuate the master member and release it when the time-stop 27 will become engaged, as in Fig. 5, and when pressure on the operating member is released the parts will be in the position in Fig. 6, the engaging projections 31 and forming part of the operating member and controlling member, a toggle which cannot be moved down preventing the complete movement of the controlling member to release the master member; but upon a second pressure on the operating member the projection will be moved upwardly, the time-stop will be released from the master member, and the parts will return to the position in Fig. -l.

\Vhen making instantaneous exposure, the pin on the arm Si is on the concentric portion 391 of the setting member 239 and controlling member is out of the path of the master member; but in order to control the latter to make automatic exposures olf different duration I provide a retarding device connected to the master member or one of the operating parts by a latch connection, the duration of the engagement of the parts being capable of regulation. In iarrying out this part of my invention in the present embodiment I provide upon the front of the casing a closed cylinder 50, in which operates a plunger or piston 51, pivotally connected to the end of a lever 52, pivoted at 53 and operated. down wardly by a spring 54, the piston litting the cylinder sufficiently accurately to permit the outward movement at a practically unil'orm speed when operated upon by the master member. The connection between the master member and the retarding device in the present arrangement consists of a pivoted latch 55, pivoted at on the master member, having the hooked end beveled on the outer edge, as shown, and operated upon by a spring 57 to throw the engaging portion into the path of the pin or projection 58 on. the lever 52. The latch is also provided with a projection normally pressed into contact with the cam-surface (50 of the setting member 31), whereby the position of the engaging portion of the latch may be adjusted relatively to the pin 58 of the retarding device and its engagement therewith changed to vary the duration of the exposure.

\Vhen the setting member is moved to adjust the controlling device to make time or bulb exposure, the higher portion of the cam (it) holds the latch away from the pin 58, so that it will not engage the lever, as shown in Figs. 1- to 7, inclusive; but when said setting member is adjusted to the position shown in Figs. Sand 9 the latch is free to move into the path of and to engage the pin 58 during the first or inward movement of the master member by the operating member, and during the outward movement of the master member when operating on the shutter it is connected to and its speed is controlled by the retarding device until the latch is released by having its engaging portion pass off the pin 58, and then the piston is returned to normal position by its spring, ready for the next operation. By adjusting the setting member the position of the latch may be varied, so that the engagement of the master member and retarding device will continue during nearly the entire movement of the master member, thereby making a lon automatically-tiined exposure, or it may be adjusted so it will only engage it and retard the movement for a very short time, making a IIO short exposure, a trifle longer than that made by an absolutely free movement of the master member, and any adjustment to vary the length of time between the extremes may be accomplished.

The position of the latch and its plane of movement to release the master member relative to that of the latter are such that the friction and wearbetween the parts are slight and the movement of the master member can be accurately controlled.

The operating member may be moved by hand, if desired, the end projecting through the casing for this purpose; but I also provide an ordinary pneumatic engine having a cylinder '70, in which operates a piston connected to a pivoted lever 72, having a pin 73 passing through a slot in the casing and engaging beneath the operating-lever, as shown.

It will be understood that the particular form, number, or arrangement of blades or leaves employed in the shutter is immaterial and the term blade used in the claims is simply a generic term referring to a light-excluding medium of any desired construction.

I claim as my invention 1. In a shutter, the combination with a shutter-blade, a movable master member for operating it and a retarding device for the latter, of a latch connection between the retarding device and master member causing their connection for movement when the master member is moved in one direction.

2. In a shutter, the combination with a shutter-blade, a movable master member [or operating it and a retarding device for the latter, of a latch connection between the retarding device and master member for causing their connection when the master member is moved in one direction and their automatic disconnection when moved in the opposite direction.

3. In a shutter, the combination with a shutter-blade, a movable master member for operating it and a retarding. device for the latter, of a latch connection between the re tardin g device and master member for causing their connection when the master member is moved in one direction and a stop cooperating with the latch to release the retarding device during its movement.

4. In a shutter, the combination with a shutter-blade, a movable master member for operating it and a retarding device for the latter, of a latch connection between the retarding device and master member for causing their connection when the master member is moved in one direction and an adj ustable stop cooperating with the latch to re lease the retarding device during the move ment in the opposite direction.

5. In a shutter, the combination with a shutter-blade, a movable master member for operating it and a retarding device for the latterhaving a movable member, of a movable connecting device carried by one of the members for engaging the other and a relatively stationary part engaging the connecting dcviee to release it from one of the members.

(3. In a shutter, the combination with a shutter-blade, a movable master member for operating it and a retarding device for the latter having a movable member, of a movable spring-operated eonnectin g device carried by one of the members for engaging the other and a relatively stationary member for engaging the connecting device to release it from one of the members.

7. In a shutter, the combination with a shutter-blade, a movable master member for operating it, and a retarding device for the latter having a movable member, of a movable spring-operated connecting device carried by one of the members for en gagingthe other and a relatively stationary part or member engaged by the connecting device to release it from one of the members, said part or member being adjustable to vary the time of release relatively to the movement of said members.

8. In a shutter, the combination with a shutter-blade, a movable master member for operating it, and a retarding device for the latter having a movable member, of an engaging device pivoted 011 the master member and adapted to engage the movable member of the retarding device when moving in one direction and an adjustable plate for controlling the release of said device.

9. In a shutter, the combination with a shutter-blade, a movable master member for operating it, and a retarding device 'for the latter having a movable member, of a springoperated latch pivoted on the master member and adapted to engage the movable member of the retarding device and the adjustable cam-plate for releasing the latch.

10. In a shutter, the combination with a shutterblade, a springactuated master member for operating it, an operating member for actuating the master member, and a retarding device embodying a movable member, of a pivoted latch on the master member for engaging the retarding device during the operating movement of the master member and an adjustable releasing device for controlling the connection of the latch.

11. In a shutter, the combination with a shutter-blade, an exposure member, a springoperated master member having a latch connection with the exposure member, an operating member, a lever actuated thereby and a latch connection between it and the master member, of adjustable time and bulb stops for controlling the master member and operated upon by the operating member.

12. In a shutter, the combination with a shutter-blade and a master member for oper direction and cooperating with the controlling member to release it.

13. In a shutter, the combination with a shutter-blade, a spring-operated master memher having a latchconnection therewith, an operating member,a latch connection between it and the master member, a controlling member cooperating with the master member and actuated by the operating member, of a retarding device embodying a movable member, a latch arranged between the said member of the retarding device and the master member and an adjustable setting member adapted to operate the controlling member and to govern the latch connection between the master and retarding members.

14:. In a shutter, the combination with a shutter-blade, a master member, and devices for controlling the movement of the latter, of a retarding device having a movable member, a latch connection between it and the master member and a movable setting member operating upon the controlling devices and havin g the cam-surface cooperating with the latch to disconnect the master member and retarding device at different points in its movement.

' 15. In a shutter, the combination with the annular casing, a shutter-blade, means for operating and controlling it and a retarding device, of a setting member embodying the retary annular plate fitting within the casing and having cam-surfaces thereon for varying the operation of the retarding device and adj usting the controlling devices.

16. In a shutter, the combination with. the annular easing, a shutter-blade, means for operating and controlling it and a retarding device, of a setting member for adjusting the controlling and retarding devices composed of the annular plate fitting within the casing having the integral spring-finger engaging the latter and the cam-surfaces thereon.

'IIIEODOR BRUEOK.

Witnesses:

G. WILLARD R1011, ELIZABETH J. PERRY. 

